Dual drive co-rotating spinning scroll compressor or expander

ABSTRACT

A dual-drive co-rotating scroll device includes a housing; a first scroll rotatably mounted within the housing via a first cylindrical extension and a first plurality of bearings, and having a first axis of rotation; and a second scroll rotatably mounted within the housing via a second cylindrical extension and a second plurality of bearings, and having a second axis of rotation different than the first axis of rotation. At least one of the first cylindrical extension and the second cylindrical extension may comprise a plurality of permanent magnets and operate as a rotor of a first motor. An Oldham ring may be positioned between the first scroll and the second scroll and configured to maintain a relative angular position between the first scroll and the second scroll.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application claims the benefit of U.S. Provisional PatentApplication No. 62/699,536, filed Jul. 17, 2018 and entitled “Dual DriveCo-Rotating Spinning Scroll Compressor or Expander”; U.S. ProvisionalPatent Application No. 62/816,715, filed Mar. 11, 2019 and entitled“Dual Drive Co-Rotating Spinning Scroll Compressor or Expander”; andU.S. Provisional Patent Application No. 62/834,157, filed Apr. 15, 2019and entitled “Dual Drive Co-Rotating Spinning Scroll Compressor orExpander.” The entirety of each of the foregoing applications is herebyincorporated by reference herein for all purposes.

GOVERNMENT LICENSE RIGHTS

This invention was made with government support under DE-AR0000648awarded by the U.S. Department of Energy. The government has certainrights in the invention.

FIELD

The present disclosure relates to scroll devices such as compressors,expanders, or vacuum pumps, and more particularly to dual driveco-rotating scroll devices.

BACKGROUND

A typical scroll compressor generally provides two scrolls to compressor pressurize fluid such as liquids and gases. A traditional orbitingscroll compressor design has one scroll which is fixed and a secondscroll that orbits relative to the fixed scroll, without rotating.

Similarly, a typical scroll expander generally provides two scrolls thatare used to convert energy from expanding gas into rotational energy. Atraditional orbiting scroll expander design has one scroll which isfixed and a second scroll that orbits relative to the fixed scroll,without rotating.

In known scroll compressors, two co-rotating scrolls may be coupled withone another by way of idler shafts and/or a metal bellows.

SUMMARY

Co-rotating scroll compressor devices according to some embodiments ofthe present disclosure utilize a novel compressor design and operate athigher speeds than traditional orbiting scroll compressors. The twoscroll housings have an offset center, resulting in a similar relativemotion between the scrolls as in an orbiting scroll design. However, thehigher operating speeds allow for a reduction in overall size whencompared to a traditional orbiting design.

Idler shaft bearing failures and/or bellow failures limit the lift oftraditional scroll compressors that utilize idler shafts and/or abellows. Moreover, in scroll compressor designs that use a bellows, itcan be challenging to keep the desired phasing of the two scrollsrelative to one another.

Embodiments of the present disclosure may address one or more of theseand/or other drawbacks of the prior art.

Although one or more aspects of the present disclosure may beillustrated with respect to a scroll compressor or a scroll expander,the present disclosure is generally applicable to and includes any typeof scroll device, without limitation.

The term “scroll device” as used herein refers to scroll compressors,scroll vacuum pumps, scroll expanders, and similar mechanical devices.Persons of ordinary skill in the art will understand that basicmodifications may need to made to aspects of the present disclosure toenable usage of the present disclosure with scroll expanders, whichbasic modifications are well within the knowledge and skill of a personof ordinary skill in the art.

The phrases “at least one”, “one or more”, and “and/or” are open-endedexpressions that are both conjunctive and disjunctive in operation. Forexample, each of the expressions “at least one of A, B and C”, “at leastone of A, B, or C”, “one or more of A, B, and C”, “one or more of A, B,or C” and “A, B, and/or C” means A alone, B alone, C alone, A and Btogether, A and C together, B and C together, or A, B and C together.When each one of A, B, and C in the above expressions refers to anelement, such as X, Y, and Z, or class of elements, such as X₁-X_(n),Y₁-Y_(m), and Z₁-Z_(o), the phrase is intended to refer to a singleelement selected from X, Y, and Z, a combination of elements selectedfrom the same class (e.g., X₁ and X₂) as well as a combination ofelements selected from two or more classes (e.g., Y₁ and Z_(o)).

The term “a” or “an” entity refers to one or more of that entity. Assuch, the terms “a” (or “an”), “one or more” and “at least one” can beused interchangeably herein. It is also to be noted that the terms“comprising”, “including”, and “having” can be used interchangeably.

It should be understood that every maximum numerical limitation giventhroughout this disclosure is deemed to include each and every lowernumerical limitation as an alternative, as if such lower numericallimitations were expressly written herein. Every minimum numericallimitation given throughout this disclosure is deemed to include eachand every higher numerical limitation as an alternative, as if suchhigher numerical limitations were expressly written herein. Everynumerical range given throughout this disclosure is deemed to includeeach and every narrower numerical range that falls within such broadernumerical range, as if such narrower numerical ranges were all expresslywritten herein.

The preceding is a simplified summary of the disclosure to provide anunderstanding of some aspects of the disclosure. This summary is neitheran extensive nor exhaustive overview of the disclosure and its variousaspects, embodiments, and configurations. It is intended neither toidentify key or critical elements of the disclosure nor to delineate thescope of the disclosure but to present selected concepts of thedisclosure in a simplified form as an introduction to the more detaileddescription presented below. As will be appreciated, other aspects,embodiments, and configurations of the disclosure are possibleutilizing, alone or in combination, one or more of the features setforth above or described in detail below.

BRIEF DESCRIPTION OF THE DRAWINGS

The accompanying drawings are incorporated into and form a part of thespecification to illustrate several examples of the present disclosure.The drawings are not to be construed as limiting the disclosure to onlythe illustrated and described examples.

FIG. 1A is a perspective view of a co-rotating dual motor scroll deviceaccording at least some embodiments of the present disclosure;

FIG. 1B is a side view of a co-rotating dual motor scroll deviceaccording to at least some embodiments of the present disclosure;

FIG. 1C is a side cross-sectional view of a co-rotating dual motorscroll device according to at least some embodiments of the presentdisclosure;

FIG. 2 is a side view of a scroll housing of a dual motor scroll deviceaccording to at least some embodiments of the present disclosure;

FIG. 3 is a side cross-sectional view of a scroll device according to atleast some embodiments of the present disclosure;

FIG. 4 is a side cross-sectional view of a co-rotating single motorscroll device with gear drive according to at least some embodiments ofthe present disclosure;

FIG. 5 is a perspective view of a co-rotating single motor scroll devicewith belt drive according to at least some embodiments of the presentdisclosure;

FIG. 6 is an exploded view of a co-rotating single motor scroll devicewith belt drive according to at least some embodiments of the presentdisclosure;

FIG. 7 is a cross-sectional view of a co-rotating single motor scrolldevice with belt drive according to at least some embodiments of thepresent disclosure;

FIG. 8 is a perspective view of a turbine-driven spinning scroll deviceaccording to at least some embodiments of the present disclosure;

FIG. 9 is a perspective cross-sectional view of a turbine-drivenspinning scroll device according to at least some embodiments of thepresent disclosure;

FIG. 10 is a side cross-sectional view of a turbine-driven spinningscroll device according to at least some embodiments of the presentdisclosure; and

FIG. 11 is a block diagram of a controller according to at least someembodiments of the present disclosure.

DETAILED DESCRIPTION

Before any embodiments of the disclosure are explained in detail, it isto be understood that the disclosure is not limited in its applicationto the details of construction and the arrangement of components setforth in the following description or illustrated in the figures. Thedisclosure is capable of other embodiments and of being practiced or ofbeing carried out in various ways. Also, it is to be understood that thephraseology and terminology used herein is for the purpose ofdescription and should not be regarded as limiting. The use of“including,” “comprising,” or “having” and variations thereof herein ismeant to encompass the items listed thereafter and equivalents thereofas well as additional items. Further, the present disclosure may useexamples to illustrate one or more aspects thereof. Unless explicitlystated otherwise, the use or listing of one or more examples (which maybe denoted by “for example,” “by way of example,” “e.g.,” “such as,” orsimilar language) is not intended to and does not limit the scope of thepresent disclosure.

A dual drive co-rotating scroll device 100 is shown in FIGS. 1A-1C. Asdescribed in more detail below, the scroll device 100 specificallyutilizes two motors to drive the scrolls thereof and to keep theappropriate phasing of the two scrolls. A feedback device (comprisingone or more sensors) and controller are used to control the phasing ofboth motors. The purpose of the co-rotating scroll device 100 is tocompress any gaseous operating fluid (or pump any liquid operatedfluid), although the design of the scroll device 100 can be utilized forany co-rotating scroll compressor, expander or pump. Additionally, thedesign can be operated oil free or have oil entrained in the operatingfluid.

The scroll device 100 comprises a single, central, scroll housing 104.The scroll housing 104 comprises two cylindrical portions 104A and 104B.The cylindrical portion 104A has an axis 106A, and the cylindricalportion 104B has an axis 106B that is offset from the axis of thecylindrical portion 104A. A scroll plate 108 is secured to eachcylindrical portion 104A, 104B with a plurality of bolts 112 or othermechanical fasteners. The scroll housing 104 and each scroll plate 108may be made, for example, of aluminum, an aluminum alloy, or any othermetal or metal alloy. In some embodiments, the scroll housing 104 mayalternatively be made of composite or another non-metallic material.

Turning briefly to FIG. 2, in addition to utilizing a plurality of bolts112 or other mechanical fasteners to secure the scroll plates 108 to thescroll housing 104, in some embodiments a sets of dowel pins are used toensure the proper positioning of each scroll plate 108 relative to thescroll housing 104, and thus to achieve fine control over the relativedistance between the two orbiting scroll axes 106A and 106B. Morespecifically, because the fasteners 112 that mate the scroll plates 108to the scroll housing 104 do not fully constrain the position of thescroll plates 108 (and of the rotational axes 106A and 106B of theorbiting scrolls 160 and 164), a pair of locating dowel pins may beinserted into one of the sets of dowel pin receptacles 114A, 114B, 114C,114D, 114E, 114F. The dowel pin receptacles 114 have offset positions,such that moving the dowel pins from one set of receptacles 114 toanother set of receptacles 114 will slightly adjust the position of thescroll plate 108 relative to the scroll housing 104, and thus of thecorresponding scroll 160 or 164 and its axis of rotation 106A, 106B. Asshown in FIG. 2, the dowel pin receptacles 114 may be arranged toalternate with the fasteners 112 around the edge of the scroll plate 108and scroll housing 104.

Each pair of dowel pin receptacles 114 may be disposed along a line thatpasses through the center of the scroll plate 108, and the distancebetween each pair of dowel pin receptacles 114 along that line may beoffset slightly relative to the distance between an adjacent pair ofdowel pin receptacles 114. For example, one pair of dowel pinreceptacles 114 may be five hundredths of an inch closer to each other,or farther away from each other, than an adjacent pair of dowel pinreceptacles 114.

Referring again to FIGS. 1A-1C, each scroll plate 108 is stepped, so asto comprise a raised portion 192. The raised portion 192 maybeneficially allow the volume enclosed within the scroll housing 104 andthe scroll plate 108 to be increased, and/or may beneficially give thescroll plate 108 sufficient thickness for the machining therein of, forexample, any structural features needed to support the internalcomponents of the scroll device 100 and/or of any cooling channels orother desired internal features. The raised portion 192 also comprises afirst aperture 176 and a second aperture 180. The first aperture 176enables electrical wires to extend from an encoder located within thehousing 104 to a controller positioned outside of the housing 104. Thesecond aperture 180 may be used as a working fluid inlet. In someembodiments, however, a radial filter may separate (or be positionedover the joint between) the two cylindrical portions 104A, 104B of thehousing, and the scroll device 100 may receive working fluid through theradial filter.

On each side of the scroll device 100, a plurality of bolts 120 secure amotor housing 116 and a motor mount 196 to the scroll plate 108 on thatside of the scroll device 100, with a flange of the motor mount 196positioned between the scroll plate 108 and a flange of the motorhousing 116. The motor housing 116 is substantially cylindrical, with afirst portion 116A proximate the scroll plate 108 and having a firstouter diameter, and a second portion 116B distal from the scroll plate108 and having a second outer diameter greater than the first outerdiameter. An aperture 188 is provided in the second portion 116B. Insome embodiments, motor coolant may be routed to and/or from the motor146 via the aperture 188. The motor 146 may utilize, for example, liquidcooling to remove heat therefrom.

The larger second outer diameter of the second portion 116B providessufficient thickness for the motor housing 116 to receive a plurality ofbolts 128, which are used to secure an endplate 124 to the motor housing116. The endplate 124 covers the end of the motor housing 116 that isdistal from the scroll plate 108. Two apertures 132 and 136 are providedin the endplate 124. Wires may extend through the aperture 132 toprovide electricity and/or control signals to the motor 146 positionedinside the motor housing 116 from a battery and/or controller positionedoutside of the motor housing 116. The aperture 136 is a working fluidoutlet.

Like the scroll housing 104, the motor housing 116, the motor mount 196,and the endplate 124 may be made, for example, of aluminum, an aluminumalloy, or any other metal, metal alloy, composite, or other suitablenon-metallic material. In some embodiments, at least the motor mount196, and possibly also one or more of the scroll housing 104, the scrollplate 108, the motor housing 116, and the endplate 124, is made of anon-magnetic metal to avoid interfering with the operation of the motor146.

Although the scroll device 100 is illustrated as utilizing a specificnumber of bolts 112 spaced at a specific angular interval, a specificnumber of bolts 120 also spaced at a specific angular interval, and aspecific number of bolts 128 also spaced at a specific angular interval,embodiments of the present disclosure may comprise more or fewer bolts112, 120, and/or 128, which may be spaced at greater or smaller angularintervals than the angular intervals illustrated in FIGS. 1A-1C.Additionally, in some embodiments, mechanical fasteners other than boltsmay be used to secure the scroll plate 108 to the scroll housing 104,and/or to secure the motor housing 116 and the motor mount 192 to thescroll plate 108, and/or to the secure the endplate 124 to the motorhousing 116. Also in some embodiments, adjacent ones of the scrollhousing 104 (or a cylindrical portion 104A, 104B thereof), the scrollplate 108, the motor mount 196, the motor housing 116, and the endplate124 may be integrally formed, or may be formed separately and thenpermanently attached to each other (via welding or otherwise).

FIG. 1C provides a side cross-sectional view of the scroll device 100.The scroll housing 104, scroll plate 108, bolts 112, motor mount 196,motor housing 116, bolts 120, endplate 124, and bolts 128 are all shownin FIG. 1C. Also visible in FIG. 1C are the apertures 132, 136, 176, and180.

Inside the volume formed by the scroll housings 104 and the scrollplates 108 are two opposing scrolls 160 and 164, each comprising aninvolute 160A and 164A, respectively. Relative motion of the involutes160A and 164A causes working fluid to be trapped within pockets formedbetween the two involutes 160A and 164A. These pockets continuously movethe working fluid toward the center of the involutes 160A and 164A asthe involutes 160A and 164A move relative to each other. The pocketsalso decrease in size, thus compressing the working fluid (for scrolldevices that, like the scroll device 100, are scroll compressors). Toprevent leakage of working fluid from inside these pockets, tip seals172 are provided along the distal edge of each involute 160A and 164A.More specifically, a tip seal 172A is provided along the edge of theinvolute 160A that is proximate the scroll 164 (such that the tip seal172A contacts the scroll 164), and another tip seal 172B is providedalong the edge of the involute 164A that is proximate the scroll 160(such that the tip seal 172B contacts the scroll 160).

The scroll 160 is secured to a cylindrical extension 162 that extendsaway from the scroll 164 and inside the motor housing 116 proximate thescroll 160. Similarly, the scroll 164 is secured to a cylindricalextension 166 that extends away from the scroll 160 and inside the motorhousing 116 proximate the scroll 164. Each of the cylindrical extensions162 and 166 is rotatably supported within one of the motor housings 116by two bearings 152 and 156, one positioned proximate a first end of thecylindrical extensions 162 and 166 and another positioned proximate asecond end opposite the first end of the cylindrical extensions 162 and166. The cylindrical extensions 162 and 166 therefore support thescrolls 160 and 164, respectively, within the scroll housings 104.

Also within each motor housing 116 is an electric motor 146, comprisinga stator 144 and a rotor 148. Each stator 144 is secured to the adjacentmotor mount 196. Each rotor 148 comprises a plurality of permanentmagnets, and is secured to one of the cylindrical extensions 162 and166. The stator may comprise, for example, an electromagnet that, whenenergized, creates a magnetic field that interacts with the permanentmagnets of the rotor 148 and causes the rotor 148 to spin. Thecylindrical extensions 162 and 166 thus act as the shaft of the electricmotors 146.

One or more sensors 118 is positioned between the scroll 160 and thescroll plate 108 adjacent thereto, as well as between the scroll 164 andscroll plate 108 adjacent thereto. The sensors 118 may be Hall effectsensors, optical sensors, magnetic sensors, or any other suitablesensors. The sensors 118 may be or comprise an encoder. Althoughillustrated herein as positioned between the scroll 160 and the scrollplate 108, in other embodiments, the sensors 118 may be positionedproximate the motor 146, or proximate the cylindrical extensions 162 and166. The sensors 118 are used as feedback devices to sense the angularposition and/or speed of the scrolls 160 and 164 (or of the motors 146,or of the cylindrical extensions 162 and 166), and to communicateinformation corresponding to the angular position and/or speed of thescrolls 160 and 164 to a controller 500, which is described in detailbelow in connection with FIG. 11.

During operation of the scroll device 100, uncompressed working fluid(for a scroll compressor) is received into the scroll housing 104 (andthus into the volume surrounding the scrolls 160 and 164) via theapertures 180 in the scroll plates 108. The working fluid is drawn intopockets that form between the involutes 160A and 164A, as describedabove, as the scrolls 160 and 164 move relative to each other.Compressed working fluid exits the pockets at or near the center volume186 formed by the involutes 160A and 164A. The center volume 186 is influid communication with the internal volume 184 of the cylindricalextensions 162 and 166 (e.g., via one or more apertures in the scrolls160 and 164), which internal volumes 184 are in fluid communication withthe apertures 136 adjacent thereto, respectively. The apertures 136,then, are discharge ports to which hoses, pipes, or other conduits maybe secured and utilized to route compressed working fluid to a desiredlocation.

Throughout the scroll device 100, seals 174 are used to prevent leakageof working fluid through the joints between adjacent components of thescroll device 100. For example, a seal 174 is positioned between themotor mount 196 and the scroll plate 108, and another seal 174 ispositioned proximate thereto, between the motor housing 116 and themotor mount 196. Similarly, a seal 174 is utilized between the motorhousing 116 and the motor mount 196 proximate the endplate 124, andanother seal 174 is positioned between the motor mount 196 and theendplate 124. Further, a seal 174 is positioned between the scrollhousing 104 and each scroll plate 108. These and other seals 174 may beseated inside corresponding grooves or channels. The seals 174 may bedynamic O-rings, dynamic gaskets, radial lip seals, labrynth seals,bushings, or any other seals useful for preventing leakage of a fluidthrough a joint between two components. Further, the seals 174 may bemade of compressed non-asbestos fiber, polytetrafluoroethylene (PTFE),rubber, other non-metallic materials, or any combination thereof; metal(whether a pure metal, a metal alloy, or a combination of metals ormetal alloys); or a combination of non-metallic materials and metal.Some of the seals 174 may be made of one material or combination ofmaterials, and others of the seals 174 may be made of a differentmaterial or combination of materials. Each seal 174 may be selected toprovide a needed or desired level of impermeability, compressibility,creep resistance, resilience, chemical resistance, temperatureresistance, anti-stick properties, and anti-corrosion properties.Because different scroll devices 100 may be used with different workingfluids, the seals 174 may be selected based on the particularapplication intended for the scroll device 100 in which the seals 174will be installed.

In some embodiments of the present disclosure, a scroll device such asthe scroll device 100 may comprise an Oldham ring (positioned around thecircumference of the involutes 160A, 164A of the scrolls 160 and 164) tohelp maintain proper phasing of the two scrolls 160, 164. In suchembodiments, the Oldham ring may be provided as a failsafe (e.g., toensure proper phasing even if the motors 146, as controlled by thecontroller 500, fail to do so). Regardless of whether the Oldham ring isutilized as a primary or backup phasing device, the Oldham ring may bemade of aluminum or another relatively light metal or other lightweightbut sufficiently strong material so as to minimize imbalance/vibrationresulting from the Oldham ring. In some embodiments, inserts made ofpolyetheretherketone (PEEK), PTFE, Torlon, or other wear-resistantplastics suitable for use as a lubricant may be used in portions of theOldham ring that contact the scrolls 160 and 164, whether as replaceableinserts or otherwise. Use of such inserts beneficially prevents wear onthe remaining portions of the Oldham ring (which may be made, forexample, of metal), and also allows for replacement of the inserts oncethey are sufficiently worn without having to replace the entire Oldhamring.

Additionally, the scroll device 100 may comprise an oil sump 168 in thebottom of the housing 104, in which oil sump 168 oil is provided forlubrication of the Oldham ring during operation of the scroll device100.

While Oldham rings may be used in some embodiments of the presentdisclosure, other embodiments of the present disclosure do not utilizeOldham rings.

Also in some embodiments, and as noted above, the housing 104 maycomprise one or more apertures extending entirely or partially around acircumference thereof (e.g., positioned in between the first cylindricalportion of the housing 104 and the second, offset cylindrical portion ofthe housing 104). A radial mesh filter may be positioned over or withinthe aperture(s). Inlet air or working fluid may then be drawn into thevolume enclosed by the housing 104 and the scroll plates 108 (and theninto the pockets formed by the involutes 160A and 164A) via the radialmesh filter and the aperture(s), with the radial mesh filterbeneficially filtering out dust or other particles that would otherwisebe ingested into the scroll device 100 together with the working fluid.

In some embodiments, such as that illustrated in FIG. 3, permanentmagnets 147 may be attached to the scrolls 160 and 164 (e.g., to orproximate the circumference of the scrolls 160 and 164), thus enablingthe scrolls 160 and 164 to act as the rotor(s) of an electric motor 149.An electric motor stator 145 may then be placed to around the scrolls160 and 164 (and the permanent magnets 147 attached thereto), thuscreating a direct drive system for the scrolls 160 and 164.

In a variation of the foregoing embodiments, the permanent magnets maybe attached to the scrolls 160 and 164 on a surface opposite the surfacethat comprises the involutes 160A and 164A, respectively. The stator maythen be provided on a surface of the respective scroll plate 108 facingthe surface of the scrolls 160 and 164 that comprise the permanentmagnets, so as to provide an axial flux motor for causing rotation ofthe scrolls 160 and 164. Because the diameter of the central shaft (andthus of a working fluid output aperture within the central shaft) islimited in an axial flux motor, such motors are best used on low flowrate scroll devices.

Also in some embodiments, the motors 146 or a direct drive motor 149 asdescribed above (and/or a controller of any of the foregoing) may useback emf to determine the angular position of the motor(s), after whichthe motor(s) may be driven at precisely the right voltage to maintainproper alignment between the scroll 160 and the scroll 164.

Turning now to FIG. 4, a scroll device 200 according to some embodimentsof the present disclosure utilize a gear system to transmit rotationalforce from the motor to the scrolls. The scroll device 200 comprises ahousing 202, within which two scrolls 204A, 204B are mounted on bearings220, 224, thus enabling the scrolls 204A, 204B to rotate relative to thehousing 202. Each scroll 220, 224 is fixedly secured to a drive gear208, which extends around a circumference of the scroll 220, 224. Amotor 240 is secured to the housing 202 via a housing extension 252. Themotor 240 is connected to a drive shaft 216 via a jaw coupling 236. Thedrive shaft 216 is supported within the housing by two bearings 228. Twodrive gears 212 are mounted to the drive shaft 216, with each drive gear212 positioned to engage a corresponding drive gear 208. A plurality offasteners 244, 248 are used to secure various components of the scrolldevice 200 in position. Additionally, dynamic seals 232 are utilized toreduce leakage of working fluid from the working fluid passagewaysformed by the scrolls 204A, 204B.

As with the scrolls 160, 164 of the scroll device 100, each scroll 204A,204B of the scroll device 200 comprises an involute 206A, 206B,respectively. The motion of the involutes 206A, 206B relative to eachother results in the formation of pockets in between the involutes 206A,206B. Working fluid within these pockets is compressed as the size ofthe pocket is continuously decreased, again due to the motion of theinvolutes 206A, 206B relative to each other. Tip seals 260A, 260B on theinvolutes 206A, 206B, respectively, prevent working fluid from escapingthe pockets through the joint between each involute 206A, 206B, and theopposite scroll 204B, 204A, respectively.

In operation, the motor 240 spins the drive shaft 216, thus causing thedrive gears 212 to rotate. The drive gears 212 transmit torque to thedrive gears 208, the rotation of which results in the rotation of thescrolls 204A, 204B to which they are affixed. Using the gears 208, 212beneficially allows the motor 240 to be located away from the scrolls204A, 204B, and facilitates the provision of large working fluid outlets256. This, in turn, enables the scroll device 200 to be utilized inapplications where a high flow rate is needed. Use of the drive shaft216 and the gears 208, 212 beneficially enables the use of a singlemotor to drive both of the scrolls 204A, 204B, which may helpfullyreduce cost and eliminate the need for complex sensor and/or controllersystems used to ensure proper alignment of scrolls in a dual-motorsystem.

Additionally, the use of gears 208, 212 allows the scroll device 200 tobenefit from mechanical advantage. More specifically, by adjusting thesize of the gears 208 relative to the gears 212, mechanical advantagemay be beneficially utilized to obtain the desired scroll rotation speedwhile allowing the motor 240 to operate at a different (perhaps moreefficient) speed, and/or to enable a less-powerful (and likely cheaper)motor 240 to be used than would be required with a 1:1 drive ratio.Notwithstanding the foregoing, in some embodiments, the scroll device200 may utilize a 1:1 drive ratio.

Except to the extent described or shown otherwise, the variouscomponents of the scroll device 200 may be the same as or similar tocorresponding components of the scroll device 100. For example, thehousing 202 may be made of any of the same materials as the housing 104,and the tip seals 260A, 260B may be the same as or similar to the tipseals 172A, 172B.

Turning now to FIGS. 5-7, a dual-drive co-rotating scroll device 300comprises a housing 304, a working fluid inlet 308, a working fluidoutlet 312, and a coupling 316. The housing 304 comprises a firstportion 304A, a second portion 304B, a third portion 304C, and a fourthportion 304D. The coupling 316 may be integral with the housing 304 (ormore specifically with the housing portion 304A), or the coupling 316may be manufactured separately from the housing 304 and then secured tothe housing 304 with one or more fasteners, as shown. A motor 320 isalso secured to the housing 304, and is operably connected to a driveshaft 352 within the housing. One or more wires 324 for powering and/orcontrolling the motor 320 may extend from the motor 320 to a powersource and/or controller (not shown).

Within the scroll device 300, two scrolls 356A, 356B are each supportedby a plurality of bearings 332. Each scroll 356A, 356B comprises aninvolute 358A, 358B, respectively. Each involute 358A, 358B furthercomprises a tip seal 360A, 360B, with the tip seal 360A of the involute358A positioned in between the involute 358A and the scroll 356B, andthe tip seal 360B of the involute 358B positioned in between theinvolute 358B and the scroll 356A.

A main pulley 348 is secured around a circumference of the scroll 358A,with another main pulley 348 secured around a circumference of thescroll 358B. Secondary pulleys 344 are secured to the drive shaft 352 atpositions aligned with the positions of the main pulleys 348. A belt 340connects the main pulley 348 and the secondary pulley 344, providingforce-transmitting communication therebetween. A plurality of bearings328 rotatably support the drive shaft 352 within the housing 304.

One or more dynamic seals 336 may be used within the scroll device 300to help prevent leakage of the working fluid from the within the workingfluid passages inside the scroll device 300. Additionally, variousfasteners may be used to secure components of the scroll device 300 inposition.

In operation, the motor 320 causes the drive shaft 352 to rotate,together with the pulleys 344 affixed thereto. As the pulleys 344rotate, the belts 340 transfer torque to the pulleys 348, which in turncause the scrolls 356A, 356B to which they are affixed to rotate. As thescrolls rotate, the relative movement of the involutes 358A, 358Bthereof results in compression of the working fluid, which is drawn intothe scroll device 300 via the inlet 308 and discharged via the outlet312. A hose, pipe, or other conduit may be fixedly or removably securedto the coupling 316 for routing the working fluid from the scroll device300 to a desired location.

Where the working fluid is an incompressible fluid, such that there is a1:1 ratio between the inlet volume and the outlet volume, the inlet 308and the outlet 312 may be reversed. Additionally, the scroll device 300could be modified to utilize two inlets and/or two outlets to reducethrottling effects and increase flow rate. For example, an additionalaperture could be provided in the housing 304 (and more specifically, inthe housing portion 304D) adjacent the volume 364, thus enabling thevolume 364 to serve as a second outlet (or, if the outlet 312 and inlet308 are reversed, as a second inlet).

As with the use of gears 208, 212 in the scroll device 200, the use ofpulleys 344, 348 in the scroll device 300 allows the scroll device 300to benefit from mechanical advantage. More specifically, by adjustingthe size of the pulleys 344 relative to the pulleys 348, mechanicaladvantage may be beneficially utilized to obtain the desired scrollrotation speed while allowing the motor 320 to operate at a different(perhaps more efficient) speed, and/or to enable a less-powerful (andlikely cheaper) motor 320 to be used than would be required with a 1:1drive ratio. Notwithstanding the foregoing, in some embodiments, thescroll device 300 may utilize a 1:1 drive ratio.

In both the scroll device 200 and the scroll device 300, the driveshafts 216 and 352, respectively, must remain equidistant from thecenter of rotation of each scroll of the scroll device to maintain anequal rotation speed and thus the needed relative angular positionbetween the scrolls. In some embodiments, the drive shafts 216 and 352may comprise the rotor of the motors 240 and/or 320, respectively, inwhich event the stator and other portions of the motor may be centrallymounted positioned around the drive shaft, in between the gears orpulleys that are also mounted to the drive shaft.

Use of a drive shaft and gears or pulleys to transmit power from themotor to the dual co-rotating scrolls of a scroll device such as thescroll devices 200 and 300 may beneficially reduce cost by reducing thenumber of required motors from two (e.g., in dual drive co-rotatingscroll devices where each scroll is driven by a separate motor) to one.On the other hand, embodiments that use two motors (and an Oldham ringto maintain alignment between the scrolls) may be more robust, as thescroll device can continue to operate despite the failure of one motor.

Any of the motors described herein may utilize liquid cooling to removeheat therefrom. The liquid coolant may be routed around the motor inchannels provided in the motor housing (or in any housing in which themotor is mounted) for that purpose, or the liquid coolant may be routedaround the motor via tubing, hoses, or any other suitable conduit.

Turning now to FIGS. 8-10, the present disclosure further comprises acryogenic scroll turbopump 400 driven by a turbine 450, which mayutilize a dual gear drive. The scroll turbopump 400 comprises a housing404, an inlet 408, and an outlet 412. The turbine 450 comprises aturbine housing 416, a turbine inlet 420, and a turbine outlet 424.

Two scrolls 428A and 428B (each secured to a scroll extension 432A,432B, respectively) are rotatably mounted within the housing 404, eachvia its respective scroll extension 432A, 432B and a plurality ofbearings 444. The scroll extension 432A may be integral with the scroll428A, or may be fixedly or removably secured to the scroll 428A. In someembodiments, the scroll extension 432A may be welded to the scroll 428A,while in other embodiments the scroll extension 432A may be secured tothe scroll 428A via a plurality of mechanical fasteners. The secondscroll extension 432B may also be integral with the scroll 428B, or maybe fixedly or removably secured to the scroll 428B. In some embodiments,the scroll extension 432B may be welded to the scroll 428B, while inother embodiments the scroll extension 432B may be secured to the scroll428B via a plurality of mechanical fasteners. One or more gaskets orseals (including, for example, dynamic seals) may be used to preventleakage of working fluid through joints between components of the scrollturbopump 400 (and/or between components of the turbine 450).

An inducer rotor 440 is mounted to an inducer shaft 436 that extendsthrough the pump inlet 408, with the inducer shaft 436 coaxial with thescroll 428A. The inducer rotor 440 raises the inlet pressure of theworking fluid to reduce the pressure differential between the inlet andoutlet pressures of the scroll turbopump 400, which beneficially reducesthe amount of cavitation likely to occur as the working fluid passesthrough the scrolls 428A, 428B.

Fixedly mounted to each scroll extension 432A, 432B is a gear 448, eachof which gears 448 is aligned and in contact with a corresponding gear452 fixedly mounted on the drive shaft 456. The drive shaft 456 isrotatably mounted within the housing 404 via a plurality of bearings460. The drive shaft 456 extends beyond the housing 404 and into theturbine 450, where the turbine blades 464 are mounted to the drive shaft456.

In operation, high pressure fluid enters the turbine inlet 420 andpushes against the turbine blades 464 as it passes therethrough beforeexiting the turbine outlet 424. The force of the fluid against theturbine blades 464 causes those blades 464, as well as the shaft 456 towhich they are mounted, to rotate at high angular velocity. As the shaft456 rotates, the gears 452 mounted thereto also rotate. Because thegears 452 are in force-transmitting communication with the gears 448,the gears 448 also rotate, thus causing rotation of the scrolls 428A,428B and of the impeller shaft 436 and impeller rotor 440. This causesworking fluid to be drawn into the scroll turbopump 400 via the inlet408, and discharged from the scroll turbopump 400 via the outlet 412.The inducer rotor 440 operates to provide an initial pressure increaseto the working fluid, so as to reduce cavitation as the working fluidenters the volume between the scrolls 428A, 428B and undergoes a moresignificant pressure increase.

With reference to FIG. 11, a controller 500 according to embodiments ofthe present disclosure is used control one or more of the scroll devicesdescribed herein. The controller 500 may comprise a processor 504configured to receive data from or via one or more of the memory 508,the sensor interface 516, the electronic speed control 520, and/or thecommunication interface 524. The processor 504 may also be configured toexecute instructions stored in the memory 508, and to generate one ormore control signals for transmission via the communication interface524.

The processor 504 may be or be selected from among the followingprocessors and processor families: Qualcomm® Snapdragon® 800 and 801,Qualcomm® Snapdragon® 610 and 615 with 4G LTE Integration and 64-bitcomputing, Apple® A7 processor with 64-bit architecture, Apple® M7motion coprocessors, Samsung® Exynos® series, the Intel® Core™ family ofprocessors, the Intel® Xeon® family of processors, the Intel® Atom™family of processors, the Intel Itanium® family of processors, Intel®Core® i5-4670K and i7-4770K 22 nm Haswell, Intel® Core® i5-3570K 22 nmIvy Bridge, the AMD® FX™ family of processors, AMD® FX-4300, FX-6300,and FX-8350 32 nm Vishera, AMD® Kaveri processors, Texas Instruments®Jacinto C6000™ automotive infotainment processors, Texas Instruments®OMAP™ automotive-grade mobile processors, ARM® Cortex™-M processors, andARM® Cortex-A and ARM926EJ-S™ processors. A processor as disclosedherein may perform computational functions using any known orfuture-developed standard, instruction set, libraries, and/orarchitecture.

The memory 508 may be any computer-readable memory capable of storingdata for retrieval by the processor 508. The data may comprise, forexample, instructions for operation of any of the scroll devices 100,200, 300, or 400 described herein, or any similar scroll device, andmore particularly for operation of the electrical components of any suchscroll device; instructions for receiving sensor information fromsensors such as the sensors 118, for evaluating such sensor information,and for generating one or more control signals based on such sensorinformation; for receiving and sending communications via thecommunication interface 524; for operating the electronic speed control520, whether based on information stored in the memory 508, informationreceived via the sensor interface 516, information received via thecommunication interface 524, or any combination of the foregoing; andinstructions for controlling the power supply 512 to turn on, turn off,or limit the flow of electricity to a motor or other electroniccomponent of a scroll device according to embodiments of the presentdisclosure.

The power supply 512 may be controllable by the processor 504 and maycontrol the flow of electricity to a motor or other electronic componentof a scroll device according to embodiments of the present disclosure.The power supply 512 may also act as a power conditioner, so as toensure that electricity is provided to the scroll device at theappropriate voltage level regardless of load. The power supply 512 may,for example, operate to prevent voltage spikes from being passed on tothe scroll device to which the controller 500 is connected.

The sensor interface 516 may comprise a physical and/or electricalinterface for receiving (whether directly or via the communicationinterface 524) signals from one or more sensors such as the sensors 118within a scroll device to which the controller 500 is connected. Thesensor interface 516 may convert any such signals into a format that maybe processed by the processor 504, and/or may generate one or moresignals for transmission to the processor 504 based on received sensorinformation. In some embodiments, the sensor interface 516 is configuredfor bi-directional communications with one or more sensors (e.g., whenone or more sensors connected thereto are electronically controllable orconfigurable), while in other embodiments the sensor interface 516 isonly configured to receive signals from the sensors, and not to transmitsignals to the sensors.

The electronic speed control 520, which may be controlled by theprocessor 504, controls the speed of the motor or motors of the scrolldevice to which the controller 500 is connected. For controllers 500controlling dual-motor devices, the electronic speed control 520 may beused to ensure that each motor is operating at the appropriate speed toensure that the scrolls of the scroll device maintain an appropriateangular position relative to each other. Also in such embodiments, thecontroller 500 may comprise a separate electronic speed control 520 foreach motor. For controllers 500 controlling single-motor devices, theelectronic speed control 520 may be used to maintain a motor speed thatyields the greatest efficiency, or that provides the desired flow rateof working fluid through the scroll device.

The communication interface 524 may be a wired or wireless communicationinterface, and may comprise hardware (including, for example, physicalports) and/or software. The communication interface 524 may beconfigured to receive signals from a connected scroll device and/or anycomponent thereof, and to route those signals to the processor 504, thememory 508, the sensor interface 516, or any other component of thecontroller 500 to which the signals are directed. In some embodiments,the communication interface 524 may be configured to route incomingsignals without any modification of the same, while in other embodimentsthe communication interface may be configured to convert incomingsignals from one format to another, so that the signals can be read bythe appropriate component of the controller 500.

The communication interface 524 may also be configured to transmitsignals generated by or otherwise originating within the controller 500or a component thereof. For example, in some embodiments motor controlsignals generated by the processor 504 and/or by the electronic speedcontrol 520 may be routed to the communication interface 524 fortransmission to the motor of an attached scroll device.

In some embodiments, the communication interface 524 may also beconfigured to send and receive signals via a local area network, a widearea network, the cloud, a server or computer, or any other device ornetwork. In such embodiments, the communication interface 524 may enablethe controller 500 to be remotely controlled and/or configured. Also insuch embodiments, the communication interface 524 may enable thecontroller 500 to transmit operating information about the controller500 and/or a connected scroll device to another device, where theoperating information can be analyzed or otherwise beneficiallyutilized. The communication interface 524 may be configured tocommunicate using any known protocol or protocols, including, forexample, Wi-Fi, ZigBee, Bluetooth, Bluetooth low energy (BLE), TCP/IP,WiMax, CDMA, GSM, LTE, FM, and/or AM. Thus, the communication interface524 may comprise one or more radios, one or more antennas, and othercomponents necessary for communications using these or other knownprotocols.

The present disclosure encompasses a spinning scroll device utilizing anOldham ring for phasing.

The present disclosure encompasses a spinning scroll device utilizingtwo motors to maintain phasing of two spinning involutes.

The present disclosure encompasses a spinning scroll device utilizing anoil sump at the bottom of the housing for lubrication of an Oldham ringduring operation.

The present disclosure encompasses a spinning scroll device withvariable eccentric holes integrated into the housing to change theradial clearances.

The present disclosure encompasses a spinning scroll device utilizingthe same housing for both spinning scrolls within the device.

The present disclosure encompasses a spinning scroll device utilizing amechanical face seal to separate outlet pressure from inlet pressure.

The present disclosure encompasses a spinning scroll device utilizingliquid cooling to remove heat from the motors.

The present disclosure encompasses a spinning scroll device with ahousing that comprises a radial filter to prevent dust ingestion.

Embodiments of the present disclosure include a scroll devicecomprising: a housing; a first scroll rotatably mounted within thehousing via a first cylindrical extension and a first plurality ofbearings, the first scroll having a first axis of rotation; a secondscroll rotatably mounted within the housing via a second cylindricalextension and a second plurality of bearings, the second scroll having asecond axis of rotation different than the first axis of rotation;wherein at least one of the first cylindrical extension and the secondcylindrical extension comprises a plurality of permanent magnets andoperates as a rotor of a first motor; and an Oldham ring positionedbetween the first scroll and the second scroll and configured tomaintain a relative angular position between the first scroll and thesecond scroll.

Aspects of the foregoing scroll device include: wherein the first motoris operably connected to the first scroll and a second motor is operablyconnected to the second scroll; a controller for controlling anoperating speed of the first motor and of the second motor; wherein thefirst plurality of bearings comprises a first bearing positionedproximate a first end of the first cylindrical extension and a secondbearing positioned proximate an opposite end of the first cylindricalextension; wherein the housing comprises a scroll housing, a scrollplate secured to the scroll housing, a motor housing secured to thescroll plate, and an endplate secured to the motor housing; wherein thescroll housing comprises a first cylindrical portion and a secondcylindrical portion, the first and second cylindrical portions havingoffset axes; wherein the scroll plate comprising a working fluid inletand the endplate comprises a working fluid outlet; an oil sump forlubricating the Oldham ring; wherein the Oldham ring comprises ametallic portion and a non-metallic portion; and wherein thenon-metallic portion is replaceable.

Embodiments of the present disclosure also include a co-rotating scrolldevice comprising: a housing; a first scroll rotatably mounted withinthe housing and having a first axis of rotation; a second scrollrotatably mounted within the housing and having a second axis ofrotation offset from the first axis of rotation; a motor; and a driveshaft having a third axis of rotation equidistant from the first axis ofrotation and the second axis of rotation, the drive shaft configured totransmit torque from the motor to each of the first scroll and thesecond scroll.

Aspects of the foregoing scroll device include: wherein the drive shafttransmits torque to each of the first scroll and the second scroll via aplurality of gears; wherein the drive shaft transmits torque to each ofthe first scroll and the second scroll via a plurality of belts andpulleys; wherein when the motor operates at a first rotational speed,the first scroll and the second scroll are configured to rotate at asecond rotational speed different than the first rotational speed;wherein the motor is liquid cooled; and wherein the motor is connectedto the drive shaft via a jaw coupling.

Embodiments of the present disclosure further include a scroll turbopumpcomprising: a housing defining a working fluid inlet and a working fluidoutlet; a first scroll rotatably mounted within the housing; a firstscroll extension mounted to the first scroll and extending from thefirst scroll into the working fluid inlet; an inducer shaft extendingfrom the first scroll into the first scroll extension, the inducer shaftcoaxial within the first scroll; an inducer rotor mounted to the inducershaft within the first scroll extension; a second scroll rotatablymounted within the housing; a second scroll extension mounted to thesecond scroll; a set of first gears, each one of the set of first gearsmounted to one of the first and second scroll extensions; a set ofsecond gears, each one of the set of second gears mounted to a driveshaft having an axis of rotation equidistant from an axis of rotation ofthe first scroll and the second scroll; and a turbine operably connectedto the drive shaft.

Aspects of the foregoing scroll turbopump include: wherein the turbinecomprises turbine blades secured to the drive shaft; wherein when thedrive shaft rotates at a first speed, the first scroll and second scrollrotate at a second speed different than the first speed; and wherein thedrive shaft is rotatably mounted within the housing by a plurality ofbearings.

The terms “memory” and “computer-readable memory” are usedinterchangeably and, as used herein, refer to any tangible storageand/or transmission medium that participate in providing instructions toa processor for execution. Such a medium may take many forms, includingbut not limited to, non-volatile media, volatile media, and transmissionmedia. Non-volatile media includes, for example, NVRAM, or magnetic oroptical disks. Volatile media includes dynamic memory, such as mainmemory. Common forms of computer-readable media include, for example, afloppy disk, a flexible disk, hard disk, magnetic tape, or any othermagnetic medium, magneto-optical medium, a CD-ROM, any other opticalmedium, punch cards, paper tape, any other physical medium with patternsof holes, a RAM, a PROM, and EPROM, a FLASH-EPROM, a solid state mediumlike a memory card, any other memory chip or cartridge, a carrier waveas described hereinafter, or any other medium from which a computer canread. A digital file attachment to e-mail or other self-containedinformation archive or set of archives is considered a distributionmedium equivalent to a tangible storage medium. When thecomputer-readable medium is configured as a database, it is to beunderstood that the database may be any type of database, such asrelational, hierarchical, object-oriented, and/or the like. Accordingly,the disclosure is considered to include a tangible storage medium ordistribution medium and prior art-recognized equivalents and successormedia, in which the software implementations of the present disclosureare stored.

Ranges may have been discussed and used within the forgoing description.One skilled in the art would understand that any sub-range within thestated range would be suitable, as would any number or value within thebroad range, without deviating from the invention. Additionally, wherethe meaning of the term “about” as used herein would not otherwise beapparent to one of ordinary skill in the art, the term “about” should beinterpreted as meaning within plus or minus five percent of the statedvalue.

Throughout the present disclosure, various embodiments have beendisclosed. Components described in connection with one embodiment arethe same as or similar to like-numbered components described inconnection with another embodiment.

Although the present disclosure describes components and functionsimplemented in the aspects, embodiments, and/or configurations withreference to particular standards and protocols, the aspects,embodiments, and/or configurations are not limited to such standards andprotocols. Other similar standards and protocols not mentioned hereinare in existence and are considered to be included in the presentdisclosure. Moreover, the standards and protocols mentioned herein andother similar standards and protocols not mentioned herein areperiodically superseded by faster or more effective equivalents havingessentially the same functions. Such replacement standards and protocolshaving the same functions are considered equivalents included in thepresent disclosure.

The present disclosure, in various aspects, embodiments, and/orconfigurations, includes components, methods, processes, systems and/orapparatus substantially as depicted and described herein, includingvarious aspects, embodiments, configurations embodiments,subcombinations, and/or subsets thereof. Those of skill in the art willunderstand how to make and use the disclosed aspects, embodiments,and/or configurations after understanding the present disclosure. Thepresent disclosure, in various aspects, embodiments, and/orconfigurations, includes providing devices and processes in the absenceof items not depicted and/or described herein or in various aspects,embodiments, and/or configurations hereof, including in the absence ofsuch items as may have been used in previous devices or processes, e.g.,for improving performance, achieving ease and/or reducing cost ofimplementation.

The foregoing discussion has been presented for purposes of illustrationand description. The foregoing is not intended to limit the disclosureto the form or forms disclosed herein. In the foregoing DetailedDescription, for example, various features of the disclosure are groupedtogether in one or more aspects, embodiments, and/or configurations forthe purpose of streamlining the disclosure. The features of the aspects,embodiments, and/or configurations of the disclosure may be combined inalternate aspects, embodiments, and/or configurations other than thosediscussed above. This method of disclosure is not to be interpreted asreflecting an intention that the claims require more features than areexpressly recited in each claim. Rather, as the following claimsreflect, inventive aspects lie in less than all features of a singleforegoing disclosed aspect, embodiment, and/or configuration. Thus, thefollowing claims are hereby incorporated into this Detailed Description,with each claim standing on its own as a separate preferred embodimentof the disclosure.

Moreover, though the description has included description of one or moreaspects, embodiments, and/or configurations and certain variations andmodifications, other variations, combinations, and modifications arewithin the scope of the disclosure, e.g., as may be within the skill andknowledge of those in the art, after understanding the presentdisclosure. It is intended to obtain rights which include alternativeaspects, embodiments, and/or configurations to the extent permitted,including alternate, interchangeable and/or equivalent structures,functions, ranges or steps to those claimed, whether or not suchalternate, interchangeable and/or equivalent structures, functions,ranges or steps are disclosed herein, and without intending to publiclydedicate any patentable subject matter.

Any of the steps, functions, and operations discussed herein can beperformed continuously and automatically.

What is claimed is:
 1. A scroll device comprising: a housing; a firstscroll rotatably mounted within the housing via a first cylindricalextension and a first plurality of bearings, the first scroll having afirst axis of rotation; a second scroll rotatably mounted within thehousing via a second cylindrical extension and a second plurality ofbearings, the second scroll having a second axis of rotation differentthan the first axis of rotation; wherein at least one of the firstcylindrical extension and the second cylindrical extension comprises aplurality of permanent magnets and operates as a rotor of a first motor;and an Oldham ring positioned between the first scroll and the secondscroll and configured to maintain a relative angular position betweenthe first scroll and the second scroll.
 2. The scroll device of claim 1,wherein the first motor is operably connected to the first scroll and asecond motor is operably connected to the second scroll.
 3. The scrolldevice of claim 2, further comprising a controller for controlling anoperating speed of the first motor and of the second motor.
 4. Thescroll device of claim 1, wherein the first plurality of bearingscomprises a first bearing positioned proximate a first end of the firstcylindrical extension and a second bearing positioned proximate anopposite end of the first cylindrical extension.
 5. The scroll device ofclaim 1, wherein the housing comprises a scroll housing, a scroll platesecured to the scroll housing, a motor housing secured to the scrollplate, and an endplate secured to the motor housing.
 6. The scrolldevice of claim 5, wherein the scroll housing comprises a firstcylindrical portion and a second cylindrical portion, the first andsecond cylindrical portions having offset axes.
 7. The scroll device ofclaim 5, wherein the scroll plate comprising a working fluid inlet andthe endplate comprises a working fluid outlet.
 8. The scroll device ofclaim 1, further comprising an oil sump for lubricating the Oldham ring.9. The scroll device of claim 1, wherein the Oldham ring comprises ametallic portion and a non-metallic portion.
 10. The scroll device ofclaim 9, wherein the non-metallic portion is replaceable.
 11. Aco-rotating scroll device comprising: a housing; a first scrollrotatably mounted within the housing and having a first axis ofrotation; a second scroll rotatably mounted within the housing andhaving a second axis of rotation offset from the first axis of rotation;a motor; and a drive shaft having a third axis of rotation equidistantfrom the first axis of rotation and the second axis of rotation, thedrive shaft configured to transmit torque from the motor to each of thefirst scroll and the second scroll.
 12. The co-rotating scroll device ofclaim 11, wherein the drive shaft transmits torque to each of the firstscroll and the second scroll via a plurality of gears.
 13. Theco-rotating scroll device of claim 11, wherein the drive shaft transmitstorque to each of the first scroll and the second scroll via a pluralityof belts and pulleys.
 14. The co-rotating scroll device of claim 11,wherein when the motor operates at a first rotational speed, the firstscroll and the second scroll are configured to rotate at a secondrotational speed different than the first rotational speed.
 15. Theco-rotating scroll device of claim 11, wherein the motor is liquidcooled.
 16. The co-rotating scroll device of claim 11, wherein the motoris connected to the drive shaft via a jaw coupling.
 17. A scrollturbopump comprising: a housing defining a working fluid inlet and aworking fluid outlet; a first scroll rotatably mounted within thehousing; a first scroll extension mounted to the first scroll andextending from the first scroll into the working fluid inlet; an inducershaft extending from the first scroll into the first scroll extension,the inducer shaft coaxial within the first scroll; an inducer rotormounted to the inducer shaft within the first scroll extension; a secondscroll rotatably mounted within the housing; a second scroll extensionmounted to the second scroll; a set of first gears, each one of the setof first gears mounted to one of the first and second scroll extensions;a set of second gears, each one of the set of second gears mounted to adrive shaft having an axis of rotation equidistant from an axis ofrotation of the first scroll and the second scroll; and a turbineoperably connected to the drive shaft.
 18. The scroll turbopump of claim17, wherein the turbine comprises turbine blades secured to the driveshaft.
 19. The scroll turbopump of claim 17, wherein when the driveshaft rotates at a first speed, the first scroll and second scrollrotate at a second speed different than the first speed.
 20. The scrollturbopump of claim 17, wherein the drive shaft is rotatably mountedwithin the housing by a plurality of bearings.